J Adv Prosthodont.  2019 Oct;11(5):286-296. 10.4047/jap.2019.11.5.286.

Choice of resin cement shades for a high-translucency zirconia product to mask dark, discolored or metal substrates

• Dai S
• Chen C
• Tang M
• Chen Y
• Yang L
• He F
• Chen B
• Xie H

• KMID: 2462112
• DOI: http://doi.org/10.4047/jap.2019.11.5.286

Abstract

PURPOSE
The aim was to study the masking ability of high-translucency monolithic zirconia and provide guidance in selecting resin luting cements in order to mask discolored substrates.
MATERIALS AND METHODS
160 high-translucency zirconia specimens were divided into 32 groups depending on their thickness and shades. Using five shades of try-in paste, the specimens were luted onto the sub strates (Co-Cr, precious-metal, opaque porcelain-sintered Co-Cr, opaque porcelain-sintered precious-metal, and 5M3-shade zirconia). All CIELAB color parameters were measured and statistically analyzed.
RESULTS
Zirconia shade and thickness and try-in paste shade affected CIELAB color parameters (P=.000) in different substrates groups, and there were interactions among these factors (P=.000). All five try-in paste shades can be chosen to achieve ΔE values of zirconia with 1.2 - 1.5 mm for masking dark-tooth-like 5M3-shade and zirconia with 1.5 mm for masking precious-metal groups < 2.6. Only suitable try-in paste shades were used, can ΔE values that less than 2.6 be achieved when applied translucent monolithic zirconia with 0.7-1.0 mm for masking dark-tooth-like 5M3-shade and zirconia with 0.7 - 1.2 mm for masking precious-metal groups.
CONCLUSION
Choosing suitable resin cement shades is necessary for high-translucency monolithic zirconia to achieve ideal masking ability (ΔE < 2.6) on the dark-tooth.

Keyword

Resin cement; Color; Zirconia; Post-core; Spectrophotometry

MeSH Terms

Masks*
Resin Cements*
Spectrophotometry
Resin Cements

Figure

• 

  Fig. 1 Means and standard deviations of ΔE values for Co-Cr alloy substrate groups. Groups of zirconia in 1M1 shade (A), 1M2 shade (B), 2M1 shade (C), 2M2 shade (D), 2M3 shade (E) , 3M2 shade (F), 4M2 shade (G) and 5M2 shade (H).

• 

  Fig. 2 Means and standard deviations of ΔE values for precious-metal substrate groups. Groups of zirconia in 1M1 shade (A), 1M2 shade (B), 2M1 shade (C), 2M2 shade (D), 2M3 shade (E) , 3M2 shade (F), 4M2 shade (G) and 5M2 shade (H).

• 

  Fig. 3 Means and standard deviations of ΔE values for opaque porcelain sintered Co-Cr alloy substrate groups. Groups of zirconia in 1M1 shade (A), 1M2 shade (B), 2M1 shade (C), 2M2 shade (D), 2M3 shade (E), 3M2 shade (F), 4M2 shade (G) and 5M2 shade (H).

• 

  Fig. 4 Means and standard deviations of ΔE values for opaque porcelain sintered precious-metal substrate groups. Groups of zirconia in 1M1 shade (A), 1M2 shade (B), 2M1 shade (C), 2M2 shade (D), 2M3 shade (E), 3M2 shade (F), 4M2 shade (G) and 5M2 shade (H).

• 

  Fig. 5 Means and standard deviations of ΔE values for 5M3 shade substrate groups. Groups of zirconia in 1M1 shade (A), 1M2 shade (B), 2M1 shade (C), 2M2 shade (D), 2M3 shade (E) , 3M2 shade (F), 4M2 shade (G) and 5M2 shade (H).

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